Petra Kvitova, Elena Rybakina and Madison Keys all take to the court for their first round matches later
Daniil Medvedev is out of the US Open after a dramatic first round loss to Benjamin Bonzi.
The former champion lost out in five sets in a match marred by an incident when a photographer stepped onto the court.
Medvedev subsequently challenged the umpire before play continued.
Elsewhere in the men's draw, Novak Djokovic came through his encounter with Learner Tien in straight sets.
In the women's draw, Petra Kvitova, Elena Rybakina and Madison Keys all take to the court for their first round matches later.
Emma Radacanu and defending champion Aryna Sabalenka both came through their games yesterday unscathed.

Wales Stun All Blacks To End 73-Year Wait For Victory
Ireland Face Must-Win Kosovo Clash After Narrow Defeat To Austria
Kildare Trio Feature As Ireland Overcome Fiji In Nations Championship
Kildare's Sean O'Haire Kicks Dramatic Last-Minute Winner In American College Football
Sunday Morning Sports Update
Milltown Through To Leinster Intermediate Semi-Finals After Victory Over Meath Champions
Sarsfields Leinster Championship Campaign Ends After Heavy Defeat To Cuala
More Than 20 Horses Withdrawn At Cheltenham Over Ground Conditions